SM8144B NPC | Alldatasheet
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NIPPON PRECISION CIRCUITS—1 NIPPON PRECISION CIRCUITS INC. EL Sheet Driver OVERVIEW The SM8144B is a transformer-less electroluminescent (EL) driver IC, capable of driving displays up to 80 cm in size. It is a high-efficiency driver that features revised coil switching transistor ON resistance and output circuit configuration to reduce loss, all in a compact package. A microcontroller interface pin (ENA) is provided, which can be used to control the EL driver ON/OFF func- tion. The device is available in 8-pin VSOP packages.
FEATURES
n Dedicated EL driver n 1.6 to 5.5 V supply voltage n 100mA maximum operating current DD = 3.0V , Ta n 3.5 W typical output resistance n
200 Vp-p maximum EL driver voltage*
n 31 to 1500 Hz EL drive frequency range* n High voltage CMOS Process n 8-pin VSOP plastic package *: Adjustable with external resistance.
APPLICATIONS
n Hand held PC, Palm size PC n Mobile IT equipment n White EL
ORDERING INFORMATION
(Top view) PACKAGE DIMENSIONS (Unit : mm) Device Package SM8144BV 8-pin VSOP 1CHV 2LDR 3VSS 4OSC 5 ENA
6 VDD
7 OUT2
8 OUT1
0.575 typ 3.1 – 0.3 6.4 – 0.3 0.5 – 0.2 0.1 – 0.05 0.22 – 0.1 0.65 0.12 M 0.10 0 to 10 0.15 +0.1 -0.05
NIPPON PRECISION CIRCUITS—2 BLOCK DIAGRAM PIN DESCRIPTION Pin n umber Name I / O Function
1 CHV I High-voltage DC input
2 LDR O Booster coil driver output
3 VSS – Ground
4 OSC I Coil and EL driver oscillator (oscillator frequency deter mined by e xternal resistor)
5 ENA I Enable input (built-in pull-down resistor)
6 VDD – Supply
7 OUT2 O Output 2
8 OUT1 O Output 1
80cm2< When ENA is logical "H", SM8144B is active. ROSC Oscillation Block
NIPPON PRECISION CIRCUITS—3 SPECIFICATIONS Absolute Maximum Ratings Recommended Operating Conditions Parameter Symbol Condition Rating Unit Supply v oltage r ange V DD 0.3 to 7.0 V Input voltage r ange V IN All Input pins V SS 0.3 to V DD + 0.3 V Output voltage V CHV CHV pin 0.5 to 120 V V LDR LDR pin 0.5 to 120 V V OUT1/2 OUT1, OUT2 pin 0.5 to 120 V Pow er dissipation P D T a C 140 m W T a C 100 m W Stor age temper ature r ange T STG 55 to 125 C Parameter Symbol Condition Rating Unit min typ max Supply v oltage r ange V DD2 1.6 3.0 5.5 V Oper ating temperature T OPR 40 – 85 C Oper ating current I DD2 Including coil current, V DD 3.0V , T a C – – 100 mA Including coil current, V DD 5.0V , T a C– – 6 0 m A Including coil current, V DD 3.0V , T a C– – 7 0 m A Including coil current, V DD 5.0V , T a C– – 4 2 m A Coil inductance L LDR f LDR = 64 kHz – 0.47 – m H 1. Max value is as same as Absolute Maximum Ratings.
NIPPON PRECISION CIRCUITS—4 DC Characteristics V DD = 3.0 V , T a = 25 C unless otherwise noted. Parameter Symbol Condition Rating Unit min typ max Supply voltage V DD 1.6 3.0 5.5 V CHV output v oltage V CHV 0.5 – 100 V OUT1, OUT2 HIGH-level output v oltage V OUTH – – 100 V OUT1, OUT2 LOW-le vel output v oltage V OUTL – – 0.5 V LDR output resistance R LDR I LDR = 50 mA – 3.5 5.25 W OSC oscillator frequency f OSC1 R OSC = 180 k W 205 256 307 kHz OSC oscillator frequency r ange f OSC2 32 – 1536 OUT1, OUT2 output frequency f OUT1 R OSC = 180 k W 200 250 300 Hz OUT1, OUT2 output frequency r ange f OUT2 31 – 1500 LDR inductance driver frequency f LDR1 R OSC = 180 k W 51 64 77 kHz LDR inductance driver frequency r ange f LDR2 8 – 384 ENA HIGH-level input v oltage V ENAH ENA = HIGH, V DD = 1.6 to 5.5V V DD – 0.5 – V DD + 0.3 V ENA LOW-le vel input v oltage V ENAL ENA = LOW, V DD = 1.6 to 5.5V V SS – 0.3 – V SS + 0.5 ENA input current I ENAH V ENAH = V DD = 3.0V 2.0 4.0 6.0 m A ENA r ise time t ENA – – 100 m s Oper ating current I DD1 Excluding coil current – – 1.0 m A Stand-by current I STB ENA = LOW – – 1.0 m A tENA VSS VDD VDD - 0.5 VSS + 0.5 ENA
NIPPON PRECISION CIRCUITS—5 TYPICAL APPLICATIONS n EL sheet size: 20 to 30cm , Current consumption: 20mA n EL sheet size: 30 to 50cm , Current consumption: 40mA n EL sheet size: 50 to 100cm , Current consumption: 80mA Note: Do not oper ate the SM8144B with the EL sheet NOT connected (no load to OUT1/OUT2) since the IC will be damaged. VDD 470mH Diode: TOSHIBA 1SS250 Coil: MURATA LQH4N471K04M00 EL sheet 0.1mF 100V 3.0V CHV LDR VSS OSC OUT1 OUT2 ENA 180kW 0.01mF VDD 220mH Diode: TOSHIBA 1SS250 Coil: MURATA LQH4N221K04M00 EL sheet 0.1mF 100V 3.0V CHV LDR VSS OSC OUT1 OUT2 ENA 180kW 0.01mF VDD 220mH Diode: TOSHIBA 1SS250 Coil: TOKO D73LC (817CE221M) EL sheet 0.1mF 100V 3.0V CHV LDR VSS OSC OUT1 OUT2 ENA 360kW 0.01mF
NIPPON PRECISION CIRCUITS—6 NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility fo r the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits are free from patent infr ingement. Applications for any devices shown in this data sheet are for illustr ation only and Nippon Precision Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing o r modification. The products described in this data sheet are not intended to use for the apparatus which infl uence human lives due to the failure or malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinaft er, including compliance with export controls on the distribution or dissemination of the products. Customers shall not e xport, directly or indirectly, any products without first obtaining required licenses and approv als from appropriate gover nment agencies. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome Koto-ku, Tokyo 135-8430, J apan Telephone: 03-3642-6661 Facsimile: 03-3642-6698 NP0006AE 2000.05 NIPPON PRECISION CIRCUITS INC.